JP5560007B2 - Electric motor and compressor - Google Patents

Description

  The present invention relates to an electric motor, and more particularly to an electric motor that can be suitably used for a compressor.

In compressors such as an air conditioner (air conditioner) and a refrigerator, an electric motor such as an induction motor, a reluctance motor, or a permanent magnet motor is used as a drive source. Examples of the permanent magnet motor include an interior permanent magnet motor (IPM motor) having a rotor in which a permanent magnet is inserted into a magnet insertion hole, and a rotor with a magnet attached to the surface. A surface magnet type permanent magnet motor (SPM motor) having a flux barrier motor, a flux barrier motor provided with a flux barrier, and the like are used. In an electric motor used in a compressor, a shrink fitting method is used as a method of fixing a stator in a stator insertion space formed by an inner peripheral surface of a housing. (See Patent Document 1)
In order to fix the stator in the stator insertion space of the housing using the shrink fitting method, the inner diameter of the inner peripheral surface of the housing forming the stator insertion space is slightly smaller than the outer diameter of the outer peripheral surface of the stator. Set smaller. Then, the housing is heated and thermally expanded so that the inner diameter of the stator insertion space of the housing is larger than the outer diameter of the outer peripheral surface of the stator. In this state, the stator is inserted into the stator insertion space of the housing, and then cooled to the ambient temperature (normal temperature). Thereby, the inner diameter of the stator insertion space of the housing is reduced, and the stator is fixed in the stator insertion space by the tightening force (holding force) generated by the inner peripheral surface forming the stator insertion space.

JP 2004-201428 A

In the prior art, the stator is fixed in the stator insertion space of the housing by the tightening force (holding force) generated by the inner peripheral surface forming the stator insertion space of the housing. Always under compressive stress. Generally, the stator of an electric motor is formed by laminating a plurality of magnetic plate-like members (for example, electromagnetic steel plates). Here, FIG. 32 shows the relationship between the compressive stress or tensile stress applied to the stator formed of a plurality of laminated magnetic steel sheets and the magnetic permeability of the stator. As shown in FIG. 32, the magnetic permeability of a stator formed by a plurality of laminated magnetic steel sheets decreases when the stator receives compressive stress. When the magnetic permeability of the stator decreases, the amount of magnetic flux flowing through the stator decreases, and the torque of the electric motor decreases. In order to compensate for the decrease in the torque of the motor due to the decrease in the magnetic permeability of the stator, it is necessary to increase the current flowing through the stator winding and increase the amount of magnetic flux flowing through the stator. In this case, copper loss increases due to an increase in current flowing in the stator winding. In addition, the hysteresis curve of the stator becomes large and the iron loss increases. For this reason, the efficiency of an electric motor falls.
In recent years, the use of natural refrigerant (Natural Refrigerant) having a low global warming potential (GWP) as a refrigerant (cooling medium) for compressors has been studied. In particular, carbon dioxide (CO ₂ ) that is not toxic or flammable among natural refrigerants has attracted attention. Here, when carbon dioxide is used as the refrigerant, the inside of the housing is at a higher temperature and higher pressure than when a fluorocarbon refrigerant or the like is used. When the stator is fixed in the stator insertion space of the housing by the clamping force (holding force) generated by the inner peripheral surface forming the stator insertion space of the housing, the temperature and pressure in the housing The tightening force (holding force for fixing the stator in the stator insertion space of the housing) generated by the inner peripheral surface forming the stator insertion space is reduced due to the difference between the expansion amount of the stator and the expansion amount of the housing. There is a risk. The decrease in the holding force of the stator may cause the movement of the stator in the stator insertion space, the falling from the stator insertion space, the generation of sound due to the decrease in the holding force, and the like.
The present invention was devised in view of such points, and is used for use in a high temperature / high pressure state while preventing a decrease in efficiency by suppressing a decrease in the magnetic permeability of the stator due to the compressive stress. An object is to provide a suitable electric motor.

The motor of one invention is
A housing, a stator, and a rotor, wherein the stator is formed by a plurality of stacked plate-like members and is inserted into a stator insertion space formed by an inner peripheral surface of the housing And the rotor is an electric motor that is rotatably inserted into a rotor insertion space of the stator,
The stator has a plurality of connection regions along the circumferential direction when viewed in a cross section perpendicular to the axial direction,
The plurality of plate-like members are connected in the axial direction by engaging with clamps formed on the plate-like members stacked adjacent to each other in the axial direction at the axially connected portion in the connection region. Has been
The connection region is a region surrounded by a region line that is separated by an angle θa of 15 degrees or less on both sides in the circumferential direction from a line connecting the center in the circumferential direction of the connecting portion in the axial direction and the center of the stator,
The stator is fixed to the housing by welding via a communication hole formed in the housing at a fixing location in the connection region,
The stator is configured such that when the electric motor is driven, a tensile stress that pulls the axially connected portion from the center of the stator to the outer peripheral direction is applied to the axially connected portion in the connecting region. It is an electric motor characterized by this.
The “axial direction” corresponds to the direction along the rotation axis of the rotor in a state where the rotor is inserted into the rotor insertion space of the stator.
The “circumferential direction” corresponds to a direction along the outer peripheral surface when viewed in a cross section perpendicular to the axial direction.
The “center of the stator” corresponds to the center of the rotation axis of the rotor when viewed in a cross section perpendicular to the axial direction in a state where the rotor is inserted in the rotor insertion space of the stator.
“A plurality of connection regions along the circumferential direction” means a region in which a plurality of plate-like members forming the stator are connected in the axial direction to connect axially, and is referred to as an “axial connection region”. You can also.
The description “connected in the axial direction” indicates that the plate-like members adjacent in the axial direction (stacking direction) are connected in a state where relative movement along at least the circumferential direction is restricted. Yes. Of course, not only the relative movement along the circumferential direction but also the relative movement along the axial direction may be connected in a restricted state. The position and number of the connecting portions in the connecting region in the axial direction and the method for connecting the plurality of plate-like members in the axial direction can be selected as appropriate.
The clamp is used for connecting a plurality of stacked plate-like members. The clamp is formed by processing a plate-like member, and has a recess on one side in the stacking direction and a protrusion on the other side. Then, by engaging (fitting) the projection of the clamp of one plate-like member adjacent in the axial direction (stacking direction) with the recess of the clamp of the other plate-like member, the plurality of plate-like members are connected. The
“Axis in the circumferential direction of an axially connected portion” means the center in the circumferential direction of one connected portion when the connected region has one connected portion, and has a plurality of connected portions in the connected region. In this case, it means the center in the circumferential direction of all of the plurality of connected portions.
The fixed location may be set at one location or a plurality of locations in the connection region when viewed in a cross section perpendicular to the axial direction.
“The number of connecting areas where the fixing points are provided” is applied to the entire stator by the tensile stress acting on the fixing points of the connecting area or the tensile stress acting on the connecting points in the axial direction of the connecting area by the tensile stress. It is set so that the compressive stress to be suppressed is suppressed.
In the electric motor according to the present invention, the plurality of plate-like members forming the stator are connected in the axial direction at the connecting portions in the axial direction of the plurality of connecting regions when viewed in a cross section perpendicular to the axial direction. As a result, when the stator is viewed in a cross section perpendicular to the axial direction, a combined portion with increased axial rigidity is formed along the circumferential direction. The stator includes at least a connecting portion in the axial direction of the connecting region (a combined portion with increased axial rigidity) by a tensile stress or a component of tensile stress acting on the fixing points of the plurality of connecting regions at the time of driving the electric motor. ) Is subjected to tensile stress. In this way, by applying a tensile stress to the united portion with increased axial rigidity, it is possible to effectively suppress the compression stress from being applied to the stator. Here, the amount of decrease in the magnetic permeability of the stator is smaller when tensile stress is applied than when compressive stress is applied to the stator. For this reason, in the electric motor of this invention, the fall amount of the magnetic permeability of a stator can be reduced, and the fall of the efficiency of an electric motor can be prevented. In addition, since the stator is fixed to the housing at the fixing points of the plurality of connecting regions, even if the stator and the housing expand due to temperature or pressure, the holding force for fixing the stator in the stator insertion space of the housing Can be prevented from decreasing. Furthermore, the connecting region is surrounded by a region line that is separated by an angle θa of 15 degrees or less, preferably 10 degrees or less on both sides in the circumferential direction from the line connecting the circumferential center of the axially connected portion and the center of the stator. By being defined as a region, a tensile stress is effectively applied to the center in the circumferential direction of the axially connected portion, which can sufficiently prevent a reduction in the efficiency of the motor and is fixed to the housing at a fixed portion. There is no possibility that the plate-like member is displaced in the outer circumferential direction.
In addition, as a method of inserting the stator into the stator insertion space of the housing, at least when the electric motor is driven, tensile stress is applied to the connecting portions in the axial direction of the plurality of connecting regions, and compressive stress is applied to the entire stator. Various methods that can be suppressed can be used. For example, a gap fitting method, a shrink fitting method, a press-fitting method, and the like can be used. When using the shrink-fitting method or the press-fitting method, the compressive stress that the stator receives due to the tightening by the inner peripheral surface of the housing is suppressed by the tensile stress that acts on the axially connected locations of the multiple connection areas when the motor is driven. As described above, the dimensions of the outer peripheral surface of the stator and the inner peripheral surface of the housing, the number of connection regions where the fixing points are provided, and the like are set.

In a different form of the invention, a line connecting the circumferential center of the fixed portion and the center of the stator is connected to the circumferential one side end and the circumferential other side end of the axial connecting portion, respectively. It exists in an area surrounded by a line connecting the centers of children.

In a different form of the invention, the outer peripheral surface of the stator is formed by first outer peripheral surfaces and second outer peripheral surfaces alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction. The first outer peripheral surface has a shape corresponding to the inner peripheral surface of the housing, and the second outer peripheral surface is recessed from the first outer peripheral surface toward the center of the stator. Yes.
The “shape corresponding to the inner peripheral surface of the housing” typically corresponds to a shape similar to the shape of the inner peripheral surface of the housing.
In this embodiment, in a state where the stator is inserted into the stator insertion space of the housing, communication is performed from one axial side to the other side between the second outer peripheral surface of the stator and the inner peripheral surface of the housing. A hole (passage) is formed. This hole (passage) is used, for example, as a passage through which a refrigerant flows in a compressor. In addition, the dimension of the 1st outer peripheral surface of a stator and the internal peripheral surface of a housing is set according to the method of inserting a stator in the stator insertion space of a housing. For example, when the gap fitting method is used, the dimension of the first outer peripheral surface is set slightly smaller than the dimension of the inner peripheral surface of the housing. On the other hand, when the shrink fitting method or the press-fitting method is used, the dimension of the first outer peripheral surface is set slightly larger than the dimension of the inner peripheral surface of the housing.

In a different form of the invention, the connecting region includes at least a boundary portion between the second outer peripheral surface and each of the first outer peripheral surfaces arranged on both sides in the circumferential direction with the second outer peripheral surface interposed therebetween. Includes one.

In a different form of the invention, the plurality of plate-like members are further laminated adjacent to each other in the axial direction at an axial connection location on the second outer peripheral surface in the connection region. The shaped members are connected in the axial direction by welding.

Other inventions are:
A housing, a stator, and a rotor, wherein the stator is formed by a plurality of stacked plate-like members and is inserted into a stator insertion space formed by an inner peripheral surface of the housing And the rotor is an electric motor that is rotatably inserted into a rotor insertion space of the stator,
The stator has a plurality of connection regions along the circumferential direction when viewed in a cross section perpendicular to the axial direction,
The outer peripheral surface of the stator is formed by first and second outer peripheral surfaces alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction, The outer peripheral surface has a shape corresponding to the inner peripheral surface of the housing, and the second outer peripheral surface is recessed from the first outer peripheral surface to the center side of the stator,
The connection region includes at least one of boundary portions between the second outer peripheral surface and each of the first outer peripheral surfaces arranged on both sides in the circumferential direction across the second outer peripheral surface.
The plurality of plate-like members are axially connected by welding plate-like members stacked adjacent to each other in the axial direction at the axially connected portion on the second outer peripheral surface in the connection region. Connected to
The connection region is a region surrounded by a region line that is separated by an angle θa of 15 degrees or less on both sides in the circumferential direction from a line connecting the center in the circumferential direction of the connecting portion in the axial direction and the center of the stator,
The stator is fixed to the housing by welding via a communication hole formed in the housing at a fixing location in the connection region,
The stator is configured such that when the electric motor is driven, a tensile stress that pulls the axially connected portion from the center of the stator to the outer peripheral direction is applied to the axially connected portion in the connecting region. It is an electric motor characterized by this.

In another embodiment of the present invention, a line connecting the circumferential center of the fixed portion and the center of the stator is connected to the one end portion in the circumferential direction and the other end portion in the circumferential direction of the connecting portion in the axial direction. It exists in an area surrounded by a line connecting the centers of children.

In a different form of one invention or another invention, the plurality of plate-like members are further connected in the axial direction by caulking pins arranged in the axial direction at axially connected locations in the connection region. .

In one aspect of the invention or another aspect of the invention, the connection region is provided in four to six locations along the circumferential direction.
In this embodiment, when the electric motor is driven, the stator can be fixed to the housing with an appropriate holding force, and compression stress can be suppressed from being applied to the stator.

The electric motor described above can be used as a drive source for the compressor. In particular, carbon dioxide, which is a natural refrigerant, is used as a refrigerant, and can be suitably used as a drive source for a compressor in which the inside of the housing becomes high temperature and high pressure.

  The electric motor of the present invention can prevent a decrease in efficiency due to the compression stress applied to the stator and is suitable for use in a high temperature / high pressure state. The compressor of the present invention can be suitably used in a high temperature / high pressure state while maintaining high efficiency.

It is sectional drawing of one Embodiment of the compressor in which the electric motor of this invention is used. It is sectional drawing of the stator of the electric motor of 1st Embodiment. It is the III-III sectional view taken on the line of FIG. 1 is a cross-sectional view of a stator and a housing of an electric motor according to a first embodiment. 1 is a cross-sectional view of an electric motor according to a first embodiment. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is sectional drawing of the stator of the electric motor of 2nd Embodiment. It is sectional drawing of the electric motor of 2nd Embodiment. It is the IX-IX sectional view taken on the line of FIG. It is sectional drawing of the stator of the electric motor of 3rd Embodiment. It is sectional drawing of the electric motor of 3rd Embodiment. It is the XII-XII sectional view taken on the line of FIG. It is sectional drawing of the electric motor of 4th Embodiment. It is sectional drawing of the electric motor of 5th Embodiment. It is sectional drawing of the electric motor of 6th Embodiment. It is sectional drawing of the housing of 7th Embodiment. It is sectional drawing of the electric motor of 7th Embodiment. It is the XVIII-XVIII sectional view taken on the line of FIG. It is sectional drawing of the electric motor of 8th Embodiment. It is sectional drawing of the electric motor of 9th Embodiment. It is sectional drawing of the electric motor of 10th Embodiment. It is sectional drawing of the electric motor of 11th Embodiment. It is sectional drawing of the stator of the motor of 12th Embodiment. It is sectional drawing of the stator and housing of the motor of 12th Embodiment. It is sectional drawing of the electric motor of 12th Embodiment. It is XXVI-XXVI sectional view taken on the line of FIG. It is sectional drawing of the stator of the electric motor of 13th Embodiment. It is sectional drawing of the electric motor of 13th Embodiment. It is sectional drawing of the electric motor of 14th Embodiment. It is a figure explaining a connection area | region. It is a graph which shows the relationship between the number (setting number) of a connection area | region, and an iron loss. It is a graph which shows the relationship between the compressive stress and tensile stress which are added to a stator, and the magnetic permeability of a stator.

Embodiments of the present invention will be described below with reference to the drawings.
First, FIG. 1 shows a sectional view of an embodiment 10 of a compressor using the electric motor of the present invention as a drive source. In the compressor 10 of the embodiment shown in FIG. 1, an embedded magnet type permanent magnet motor 40 is used as a drive source.
The compressor 10 according to one embodiment includes a housing 20, a compression mechanism unit 30, an embedded magnet type permanent magnet motor 40, an accumulator 80, and the like. The housing 20 is made of iron (Fe), aluminum (Al), or the like. The housing 20 is hermetically sealed and accommodates the compression mechanism 30 and the embedded magnet type permanent magnet motor 40. The housing 20 is provided with a suction pipe 81 and a discharge pipe 21.

The interior permanent magnet motor 40 includes a stator 50 and a rotor 70.
The stator 50 is formed by laminating a plurality of thin electromagnetic steel sheets. Each electromagnetic steel plate is formed with a clamp (also referred to as a “crimped portion”) for joining electromagnetic steel plates adjacent in the stacking direction. The clamp has a recess on one side in the stacking direction and a protrusion on the other side in the stacking direction. And when laminating | stacking an electromagnetic steel plate, the protrusion of the clamp of one electromagnetic steel plate adjacent to the lamination direction is fitted (engaged) with the recessed part of the clamp of the other electromagnetic steel plate. In addition, joining (for example, welding) and a caulking pin may be used in order to integrate the laminated | stacked several electromagnetic steel plate. The electromagnetic steel plate corresponds to the “plate member” of the present invention. In addition, the plate-shaped member which forms the stator 50 should just have magnetism, and is not limited to an electromagnetic steel plate. The stator 50 is provided with teeth 58 forming slots 59 on the inner peripheral side (see FIG. 3). In the slot 59, the stator winding 60 is disposed via an insulating material by, for example, a distributed winding method or a concentrated winding method. The stator 50 is fixed to the housing 20 in a state of being inserted into a space (stator insertion space) 20a (see FIG. 4) formed by the inner peripheral surface 20A of the housing 20. When viewed in a cross section perpendicular to the axial direction, the shape of the outer peripheral surface of the stator 50 and the shape of the inner peripheral surface 20A of the housing 20 can be formed in various shapes such as a circular shape and a polygonal shape.
The rotor 70 is rotatably inserted into a space (rotor insertion space) 50a (see FIG. 2) formed on the center side of the stator 50. The rotor 70 has a rotor core 71 formed by laminating a plurality of thin plate-like electromagnetic steel plates. The rotor core 71 has a rotation shaft insertion hole, a magnet insertion hole, and a caulking pin insertion hole formed in the axial direction. A rotation shaft 75 is inserted into the rotation shaft insertion hole, and a permanent magnet 72 is inserted into the magnet insertion hole. And the laminated | stacked several electromagnetic steel plate is integrated by the crimping pin 73 inserted in the crimping pin insertion hole. 74 is a balance weight for adjusting the balance of the rotor 70 (rotor core 71). Each electromagnetic steel plate is formed with a clamp (crimping portion) for joining electromagnetic steel plates adjacent in the stacking direction.

  In the present specification, in a state where the rotor 70 is rotatably inserted into the rotor insertion space 50a of the stator 50, the direction along the rotation axis 75 of the rotor 70 is “stator axis”. Corresponds to "direction". Further, when viewed in a cross section perpendicular to the axial direction, the center of the rotating shaft 75 of the rotor 70 corresponds to the “center Q of the stator”.

The accumulator 80 separates the refrigerant (cooling medium) and the lubricating oil. In the present embodiment, carbon dioxide (CO ₂ ) is used as the refrigerant. Of course, the refrigerant is not limited to carbon dioxide. The refrigerant separated by the accumulator 80 is returned to the compression mechanism unit 30 through the suction pipe 81. Further, the lubricating oil separated by the accumulator 80 is returned to the lubricating oil reservoir 33.
The compression mechanism unit 30 includes a cylinder 31 and an eccentric rotor 32 that is driven by a rotating shaft 75. The compression mechanism unit 30 compresses the refrigerant sucked from the suction pipe 81 in the cylinder 31 as the eccentric rotor 32 rotates.
The refrigerant compressed by the compression mechanism unit 30 is formed between a hole (passage) formed in the stator 50 of the interior permanent magnet electric motor 40 and between the outer peripheral surface of the stator 50 and the inner peripheral surface 20A of the housing 20. From the discharge pipe 21 through the formed hole (passage), the hole (passage hole) formed in the rotor 70, the gap (gap) between the stator 50 and the rotor 70 (rotor core 71), etc. Discharged.
Further, the lubricating oil stored in the lubricating oil reservoir 33 is supplied to the sliding portion of the compression mechanism 30 by the rotation of the rotating shaft 75. The lubricating oil that has lubricated the sliding portions is returned to the lubricating oil retainer 33.
In the compressor 10 shown in FIG. 1, a medium in which refrigerant and lubricating oil are mixed is discharged from a discharge pipe 21.
In the compressor 10 of the embodiment, the embedded permanent magnet type motor 40 is used as a drive source. However, the invention is not limited to the embedded permanent magnet type motor 40, and various types of motors are used as the drive source. Can do. Hereinafter, the embedded permanent magnet motor 40 is simply referred to as “motor 40”.

Next, a schematic configuration of the electric motor of the present invention will be described.
In a stator formed by laminating a plurality of magnetic plate members such as electromagnetic steel plates, the magnetic permeability decreases when compressive stress or tensile stress is applied. When the magnetic permeability of the stator decreases, the amount of magnetic flux flowing through the stator decreases, and the torque of the electric motor decreases. When the magnetic permeability of the stator is lowered, the efficiency of the electric motor is lowered as described above. The relationship between the compressive stress or tensile stress applied to the stator and the magnetic permeability of the stator is shown in FIG. As shown in FIG. 32, in a state where compressive stress and tensile stress are not applied to the stator, the stator has a magnetic permeability (initial value) at a location that intersects the vertical axis. When compressive stress is applied to the stator in this state, the magnetic permeability of the stator decreases from the initial value. On the other hand, when tensile stress is applied to the stator, the magnetic permeability of the stator once increases from the initial value and then decreases from the initial value. Here, as can be seen from FIG. 32, the amount of decrease in magnetic permeability when tensile stress is applied to the stator is smaller than the amount of decrease in magnetic permeability when compressive stress is applied to the stator. In other words, at least when the electric motor is driven, it is possible to suppress a reduction in the magnetic permeability of the stator by suppressing the compression stress from being applied to the stator and applying a tensile stress, thereby reducing the efficiency of the electric motor. Can be prevented.
Further, in a compressor using carbon dioxide (CO ₂ ) as a refrigerant, the inside of the housing becomes high temperature and high pressure when the electric motor (compressor) is driven, and the amount of expansion of the stator and the amount of expansion of the housing Increased when used. In general, the expansion amount of the stator and the housing due to high temperature and high pressure is larger than the expansion amount of the stator and the housing due to high temperature alone. The difference in expansion amount increases. Here, when the stator is fixed in the stator insertion space of the housing by the tightening force (holding force) by the inner peripheral surface of the housing, the difference between the expansion amount of the stator and the expansion amount of the housing increases. As a result, the holding power of the stator may be reduced. For this reason, when the electric motor is used in a high temperature / high pressure state, it is necessary to take measures to suppress a decrease in the holding power of the stator due to the expansion of the stator and the housing.
The electric motor of the present invention aims to suppress a decrease in holding power of the stator due to expansion of the stator and the housing while preventing a decrease in efficiency by suppressing a decrease in the magnetic permeability of the stator due to the compressive stress. The basic technical idea is to “apply tensile stress to the stator at least during driving of the electric motor and fix the stator to the housing so as to suppress the compressive stress from being applied to the stator”. In the electric motor of the present invention, at least when the electric motor is driven, tensile stress is applied to the stator and compression stress is prevented from being applied. Therefore, a decrease in the magnetic permeability of the stator can be prevented, and the magnetic permeability of the stator can be reduced. A decrease in the efficiency of the electric motor due to the decrease can be suppressed. Further, since the stator is pulled by the housing when the electric motor is driven, it is possible to suppress a decrease in the holding force of the stator due to the difference between the amount of expansion of the stator and the amount of expansion of the housing.

And, as a result of further examination on the configuration for effectively applying tensile stress to the stator, “a plurality of plate-like members forming the stator are seen in a cross section perpendicular to the axial direction and set along the circumferential direction. By connecting in the axial direction at the connecting points of several connecting regions, a combined part with increased axial rigidity is formed, and tensile stress is applied to the combined part with increased axial rigidity (connected part in the axial direction) Thus, it has been found that by using the configuration in which the stator is fixed to the housing at a fixed number of fixed regions in the connection region, it is possible to effectively suppress a decrease in efficiency and a decrease in the holding power of the stator.
That is, the electric motor according to the present invention is described as follows: “The plurality of plate-like members forming the stator are connected in the axial direction at a connecting portion of a set number of connecting regions along the circumferential direction when viewed in a cross section perpendicular to the axial direction. The stator is viewed in a cross section perpendicular to the axial direction, and when the motor is driven, a tensile stress is applied to the axially connected portions (merged portions) of the set number of connected regions along the circumferential direction. As a basic configuration, it is fixed to the housing at fixed locations provided in a set number of connection regions along the circumferential direction.
Note that the plurality of plate-like members forming the stator may be connected in the axial direction along the circumferential direction in a cross section perpendicular to the axial direction at a plurality of connection regions in a plurality of connection regions. Good. The number of connecting portions in the axial direction of the connecting region may be one or plural (two or more) when viewed in a cross section perpendicular to the axial direction. The fixed number of connection regions of the set number may be a single point or a plurality of portions as long as tensile stress acts on the connection points (merged points) in the axial direction of the set number of connection regions when viewed in a cross section perpendicular to the axial direction. (2 or more) may be sufficient. In addition, the fixed number of fixed regions of the connection region is between the axial one side end surface and the axial other side end surface of the stator along the axial direction (including the axial one side end surface and the axial other side end surface). These may be one place or plural (two or more) places. The width (range) of the connection area is fixed by the tensile stress acting on the fixed area of the connection area or the component of the tensile stress, and the tensile stress acts on the connection area (union part) in the axial direction of the connection area. It is set so that the compressive stress acting on the whole child is suppressed.

The stator 50 and the housing 20 are expanded in a state where the plurality of plate-like members forming the stator are connected in the axial direction at the connecting portion of the connecting region, and the stator is fixed to the housing at the fixing portion of the connecting region. In the case (expansion amount of the housing 20> expansion amount of the stator 50), the relationship between the tensile stress acting on the fixed portion and the tensile stress acting on the axially connected portion will be described with reference to FIG. FIG. 30 shows a part of a cross section of the electric motor 40 viewed from a direction perpendicular to the axial direction.
In FIG. 30, a line connecting the circumferential center of the clamp 55 (axially connected portion) and the center Q of the stator 50 indicated by a solid line is denoted by Lf. In addition, lines connecting the circumferential one end and the other circumferential end of the clamp 55 (axially connected portion) and the center Q of the stator 50 are denoted by Li and Lj, and formed by the lines Li and Lj. The angle is represented by θb. Further, a region surrounded by region lines Lg and Lh separated by an angle θa on both sides in the circumferential direction from a line Lf connecting the circumferential center of the clamp 55 (axially connected portion) and the center Q of the stator 50 is represented by a coupling region S. Has been. A line passing through the center Q of the stator 50 and intersecting with the region surrounded by the lines Li and Lj corresponds to “a line passing through the center of the stator and intersecting with the axially connected portion” of the present invention. In addition, a line Lf connecting the center Q of the stator 50 and the center of the clamp 55 (axially connected portion) in the circumferential direction intersects with the circumferential center of the axially connected portion passing through the center of the stator of the present invention. Corresponding to “To Line”.
As a method of connecting a plurality of plate-like members forming the stator 50 in the axial direction, a method of connecting the plate-like members adjacent in the axial direction (stacking direction) in the axial direction by joining (for example, welding 54). , A method of connecting in the axial direction by a clamp (caulking portion) 55 formed on a plate-like member adjacent in the axial direction (stacking direction), a method of connecting in the axial direction by a caulking pin 56 integrating a plurality of plate-like members, and the like Can be used.

Here, it is assumed that a plurality of plate-like members forming the stator 50 are connected in the axial direction by a clamp (caulking portion) 55 indicated by a solid line in the connection region S.
In this state, consider a case where the stator 50 is fixed to the housing 20 at a fixing point Wb (on the line Lf) that intersects the line Lf connecting the circumferential center of the clamp 55 and the center Q of the stator 50. That is, the fixed portion Wb and the clamp 55 (axially connected portion) and the center in the circumferential direction intersect with the line passing through the center Q of the stator 50 (θa = 0) (on the line). Consider the case where 55 is arranged. In this case, the tensile stress acting on the fixed portion Wb and pulling the fixed portion Wb from the center Q of the stator 50 in the outer peripheral direction is the tensile stress P pulling the clamp 55 from the center Q of the stator 50 in the outer peripheral direction. Works. In other words, when the circumferential center of the fixed part Wb and the clamp 55 (axially connected part) is arranged so as to intersect (on the line) with the line passing through the center Q of the stator 50, the fixed part Wb Most of the tensile stress acting on the clamp 55 acts as a tensile stress on the clamp 55 (axially connected portion).
The same applies to the case where the line connecting the circumferential center of the fixed location Wb and the center Q of the stator 50 exists within the region surrounded by the lines Li and Lj. That is, the fixed portion Wb and the clamp 55 (on the line) are arranged such that the fixed portion Wb and the clamp 55 (axially connected portion) intersect with a line passing through the center Q of the stator 50 (θa ≦ θb / 2). Even in the case of being arranged, most of the tensile stress acting on the fixed location Wb acts on the clamp 55 (axially connected location) as tensile stress.
Next, when the stator 50 is fixed to the housing 20 at a fixing point Wa that does not intersect the line connecting the clamp 55 (a connecting point in the axial direction) and the center Q of the stator 50 ([θa> θb / 2]). )think of. In this case, a part Hf = H × cos θa (Gf = G × cos θa) of the component force in the direction of the line Lf of the tensile stress H (G) acting on the fixed portion Wa is clamped 55 (a connecting portion in the axial direction). Acts as a tensile stress. Further, another part of the component force of the tensile stress H (G), for example, a component force Hk = H × sin θa in a direction orthogonal to the component force Hf (component force Gk = G × sin θa in a direction orthogonal to the component force Gf) ) Acts as a separation stress that separates the plate member fixed to the housing 20 at the fixing point Wa from the other plate members. The tensile stress acting on the clamp 55 (axially connected portion) becomes smaller as the angle θa becomes larger. On the other hand, the pulling stress acting on the plate member fixed to the housing 20 at the fixed location Wa is an angle. The larger θa becomes, the larger it becomes. For this reason, it is necessary to set the angle θa within an appropriate range. As a result of the examination, when the angle θa exceeds 15 degrees, the tensile stress acting on the clamp 55 (the axially connected portion) is small, and the pull acting on the plate-like member fixed to the housing 20 at the fixing portion Wa. It was found that the separation stress might increase and shift. If the plate-like member fixed to the housing 20 at the fixing location Wa is displaced in the outer peripheral direction, there is a possibility that an insulation failure occurs in the slot 59. Furthermore, if the angle θa is 10 degrees or less, the tensile stress acting on the clamp 55 (axially connected portion) is sufficiently large, and an effect of sufficiently preventing the decrease in efficiency can be obtained. Thus, it was found that the separation stress acting on the plate member fixed to the housing 20 is sufficiently small, and there is no possibility that the plate member is displaced.
In addition, when the some plate-shaped member which forms the stator 50 is connected in the axial direction by the some connection location in the connection area | region S (it has a some axial connection location in the connection area S). Is equivalent to the case of being connected in the axial direction at one connecting point with the center in the circumferential direction of the entire connecting point in the axial direction. For example, when a plurality of plate-like members are connected in the axial direction by clamps 55 and caulking pins 56 indicated by broken lines in FIG. 30, the circumferential center of the clamp 55 and the center Q of the stator 50 are connected. One axial connection point (in the figure, the center of the circumferential direction) of the line (Li in the figure) and the line (Lj in the figure) connecting the circumferential center of the caulking pin 56 and the center Q of the stator 50 (Lj in the figure) This is equivalent to the case of being connected in the axial direction by a clamp 55) indicated by a solid line.
Therefore, the width of the connection region S is such that the angle θa on both sides in the circumferential direction from the line Lf passing through the center in the connection direction in the connection region S (for example, the clamp 55) and the center Q of the stator 50 is 15. It is set within 10 degrees, preferably within 10 degrees. That is, the region lines Lg and Lh defining the connection region S are on both sides in the circumferential direction from the line Lf connecting the circumferential center of the axially connected portion (for example, the clamp 55) in the connection region S and the center Q of the stator 50. It is set within 15 degrees, preferably within 10 degrees.

  Furthermore, the number of connecting regions S (having at least one axial connecting portion) in which fixing points are set (having fixing points fixed to the housing 20) and iron loss of the stator The graph which shows the relationship with is shown by FIG. The graph shown in FIG. 31 is obtained when the diameter of the outer peripheral surface of the stator 50 (the first outer peripheral surface 51 in the stator 50 shown in FIG. 3) is 50 mm to 200 mm. From the graph shown in FIG. 31, the iron loss of a stator can be effectively reduced by setting the connection area | region S where the fixed location is set to 4-6 places along the circumferential direction. I understand. In addition, the number of the connection area | region S in which the fixed location is set (it has the fixed location fixed with the housing 20) respond | corresponds to the "setting number" of this invention.

  Next, an embodiment of the electric motor 40 of the present invention used in the compressor 10 will be described below. In addition, in the electric motor 40 of each embodiment demonstrated below, since the rotor of the same structure can be used, description of a rotor is abbreviate | omitted and only the structure of a stator and a housing is demonstrated.

The stator 50 of the electric motor 40 of the first embodiment is shown in FIGS. 2 is a cross-sectional view of the stator 50 (cross-sectional view along the axial direction), and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 (cross-sectional view perpendicular to the axial direction). The axial direction is the vertical direction in FIG. 2 and the direction perpendicular to the paper surface in FIG.
The stator 50 of the present embodiment is formed in an annular shape, and has an axial one side end face 50A and an axial other side end face 50B. The stator 50 has teeth 58 that form slots 59 on the inner peripheral side when viewed in a cross section perpendicular to the axial direction. A rotor insertion space 50 a in which the rotor 70 is rotatably inserted is formed on the inner peripheral side of the stator 50 by the tip surface (inner peripheral surface) of the teeth 58.

Further, the outer peripheral surface of the stator 50 is formed by first outer peripheral surfaces 51 and second outer peripheral surfaces 52 that are alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction. The second outer peripheral surface 52 is connected to each of the first outer peripheral surfaces 51 disposed on both sides in the circumferential direction with the second outer peripheral surface 52 interposed therebetween at boundary portions 51a and 51b. The first outer peripheral surface 51 has a shape corresponding to the inner peripheral surface 20A of the housing 20 (see FIG. 4). The “shape corresponding to the inner peripheral surface 20A” is typically a shape similar to the shape of the inner peripheral surface 20A. In the present embodiment, the housing 20 is formed in a cylindrical shape (the inner peripheral surface 20A has a circular cross section). For this reason, the first outer peripheral surface 51 of the stator 50 is formed in an arc shape centered on the center Q of the stator 50. The second outer peripheral surface 52 is recessed from the first outer peripheral surface 51 toward the center Q side of the stator 50 and extends in the axial direction. The second outer peripheral surface 52 forms a recess 52a cut out from a virtual outer peripheral surface (indicated by a broken line in FIG. 3) obtained by extending the first outer peripheral surface 51 along the circumferential direction.
In the present embodiment, the region surrounded by the boundary lines Lb and Lc connecting the boundary points 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 and the center Q of the stator 50 is a connecting region. S is set. That is, the connection region S includes boundary lines Lb and Lc that connect the boundary portions 51 a and 51 b between the first outer peripheral surface 51 and the second outer peripheral surface 52 and the center Q of the stator 50. In the present embodiment, the boundary lines Lb and Lc are used as region lines that define the connection region S.
In the present specification, the “connection region S provided with an axial connection portion” means a region in which a plurality of plate-like members forming a stator are connected in the axial direction, and is also referred to as an “axial connection region”. it can.

The shape (dimension) of the first outer peripheral surface 51 (or the inner peripheral surface 20A of the housing 20) is set according to the method of inserting the stator 50 into the stator insertion space 20a of the housing 20. At this time, at least when the electric motor 40 is driven, it is set so that the compressive stress is suppressed from being applied to the stator by the tensile stress acting on the fixed portion or the component force of the tensile stress.
For example, when the stator 50 is inserted into the stator insertion space 20 a using the gap fitting method, the dimension (for example, the diameter) of the first outer peripheral surface of the stator 50 is the inner peripheral surface 20 </ b> A of the housing 20. Is set slightly smaller than the dimension (for example, diameter). In this case, since the slight gap is formed between the first outer peripheral surface 51 of the stator and the inner peripheral surface 20A of the housing 20 when the electric motor 40 is not driven, the compression stress is applied to the stator 50. Is not added. It should be noted that a tightening force for tightening the first outer peripheral surface 51 may be generated due to a fixing portion between the stator 50 and the housing 20.
Alternatively, when the stator 50 is inserted into the stator insertion space 20a of the housing 20 using a shrink-fitting method or a press-fitting method, the dimension (for example, the diameter) of the first outer peripheral surface of the stator 50 is the housing. 20 is set slightly larger than the dimension (for example, diameter) of the inner peripheral surface 20A. In this case, when the electric motor 40 is not driven, a compressive stress is applied to the stator 50 by the tightening force of the inner peripheral surface 20A of the housing 20. Note that the first outer peripheral surface 51 of the stator 50 and the inner peripheral surface 20A of the housing 20 are suppressed so that the compressive stress applied to the stator is suppressed by the tensile stress acting on the axially connected portion when the electric motor is driven. The dimensions (for example, the diameter) of, and the number of connected areas in which fixed locations are set are set.

  In addition, the plurality of electromagnetic steel sheets forming the stator 50 are connected in the axial direction at the connection locations in the connection region S. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, the electromagnetic steel sheet adjacent in the axial direction (stacking direction) is welded (welded portion 54) at the location of the circumferential center 51c of the second outer circumferential surface 52. It is joined. That is, the plurality of electromagnetic steel plates are connected in the axial direction by the welded portion 54 at the location of the circumferential center 51 c of the second outer peripheral surface 52. In the present embodiment, a weld 54 that connects a plurality of electromagnetic steel plates in the axial direction is formed at a location corresponding to the recess 52a. Thereby, the stator 50 can be easily inserted into the stator insertion space 20 a of the housing 20 in a state where a plurality of electromagnetic steel plates forming the stator 50 are connected in the axial direction by the welded portion 54.

As shown in FIG. 4, the stator 50 is inserted into a stator insertion space 20 a formed by the inner peripheral surface 20 </ b> A of the housing 20. For example, it is inserted using a gap fitting method, a shrink fitting method, a press-fitting method, or the like. A cross-sectional view (cross-sectional view along the axial direction) of the electric motor 40 in which the stator 50 is inserted into the stator insertion space 20a of the housing 20 is shown in FIG. 5, and a cross-sectional view taken along the line VI-VI in FIG. FIG. 6 shows a cross-sectional view at right angles.
In addition, the stator 50 is inserted into the stator insertion space 20a and then fixed to the housing 20 at a fixing location in the connection region S. In the present embodiment, the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 of the stator 50 are connected to the center Q of the stator 50 when viewed in a cross section perpendicular to the axial direction. A region surrounded by the boundary lines Lb and Lc is set as the connection region S. That is, the boundary lines Lb and Lc are used as area lines that define the connection area S (the connection area S includes the boundary lines Lb and Lc). Moreover, both the boundary locations 51a and 51b are set as fixed locations. In addition, a welding method is used as a method of fixing the stator 50 to the housing 20. Further, one axial end surface 50 </ b> A is set as an axial fixing portion for fixing the stator 50 to the housing 20. That is, the stator 50 includes both the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 on the end surface 50A on one axial side of the end surfaces 50A and 50B on both axial sides. It is welded (fixed) to the housing 20 by a welded portion 53a at a location (fixed location).
As a method for welding the stator 50 to the housing 20, for example, a laser welding method, a TIG welding method, a MIG welding method, or the like is used.
In the present embodiment, a hole (passage) 52a that communicates from one axial side to the other axial side is formed between the second outer circumferential surface 52 of the stator 50 and the inner circumferential surface 20A of the housing 20. . The hole (passage) 52 a is used as a passage for flowing a refrigerant or the like of the compressor, but can also be used for cooling the welded portion 53 a for welding the stator 50 and the housing 20. For example, when forming a welded portion 53a for welding the stator 50 to the housing 20 at the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52, the inside of the hole (passage) 52a By letting cooling air flow through, the temperature of the welded portion 53a can be lowered in a short time. As a result, molten metal or the like can be prevented from flowing through the hole (passage) 52a, and the insulating member that insulates the slot 59 of the stator 50 from the stator winding 60 is melted, resulting in poor insulation. Can be prevented.
In the present embodiment, the stator 50 can be fixed to the housing 20 by the welded portion 53b on the end surface 50B on the other axial side of the stator 50. Further, the stator 50 can be fixed to the housing 20 by the welded portions 53a and 53b on the end surface 50A on the one axial side and the end surface 50B on the other axial side of the stator 50. Further, the method of joining the stator 50 to the housing 20 is not limited to the welding method.
In this specification, “the connection region S provided with a fixing portion for fixing the stator to the housing among the connection regions S” means a connection region fixed to the housing, and “a connection region fixed to the housing ( Axis connecting region) ”

FIG. 7 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the stator 50 of the electric motor 40 of the second embodiment.
In the present embodiment, the outer peripheral surface of the stator 50 is formed by the first outer peripheral surface 51 and the second outer peripheral surface 52 that are alternately arranged along the circumferential direction, as in the first embodiment. Has been. Similarly to the first embodiment, each of the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 and the center Q of the stator 50 when viewed in a cross section perpendicular to the axial direction. Boundary lines Lb and Lc are used as area lines that define the connection area S (the connection area S includes the boundary lines Lb and Lc).
In addition, the plurality of electromagnetic steel sheets forming the stator 50 are connected in the axial direction at the connection location of the connection region S. As shown in FIG. 7, in the present embodiment, when seen in a cross section perpendicular to the axial direction, it intersects with a line La connecting the circumferential center 51 c of the second outer peripheral surface 52 and the center Q of the stator 50 (line It is connected in the axial direction by a clamp 55 at a connection point (on La). For example, the protrusion of the clamp 55 formed on one electromagnetic steel plate adjacent in the axial direction (stacking direction) is fitted (engaged) with the recess of the clamp 55 formed on the other electromagnetic steel plate. Thereby, relative movement along the circumferential direction of the electrical steel sheet adjacent in the axial direction (stacking direction) is restricted. In other words, the plurality of electromagnetic steel plates are connected in the axial direction by the clamp 55.
In the present embodiment, a plurality of electromagnetic steel sheets can be connected in the axial direction using a clamp for connecting the electromagnetic steel sheets adjacent in the stacking direction.

After the stator 50 is inserted into the stator insertion space 20 a of the housing 20, the stator 50 is fixed to the housing 20 at the fixing portion of the connection region S. FIG. 8 shows a cross-sectional view (cross-sectional view along the axial direction) of the electric motor 40 in which the stator 50 is inserted into the stator insertion space 20a of the housing 20, and a cross-sectional view taken along the line IX-IX in FIG. 9 is shown in FIG. In the present embodiment, similarly to the first embodiment, both of the boundary portions 51 a and 51 b are set as fixed portions, and a welding method is used as a method for fixing the stator 50 to the housing 20. In addition, as a fixing location for fixing the stator 50 to the housing 20, a location on the one axial end surface 50A is set.
In the present embodiment, the welded portion 53b or the end portion 50B of the stator 50 in the axial direction other end surface 50B, or the both end surfaces of the axial one end surface 50A and the other axial end surface 50B of the stator 50, or The stator 50 can also be fixed to the housing 20 by the welded portions 53a and 53b.

A sectional view (a sectional view perpendicular to the axial direction) of the stator 50 of the electric motor 40 of the third embodiment is shown in FIG.
In the present embodiment, the outer peripheral surface of the stator 50 is formed by the first outer peripheral surface 51 and the second outer peripheral surface 52 that are alternately arranged along the circumferential direction, as in the first embodiment. Has been. Similarly to the first embodiment, each of the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 and the center Q of the stator 50 when viewed in a cross section perpendicular to the axial direction. The boundary lines Lb and Lc that connect the two are used as area lines that define the connection area S (the connection area S includes the boundary lines Lb and Lc), and both of the boundary points 51a and 51b are set as fixed points.
In addition, the plurality of electromagnetic steel sheets forming the stator 50 are connected in the axial direction at the connection location of the connection region S. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, at a connecting point that intersects a line La (on the line La) connecting the circumferential center 51c of the second outer circumferential surface 52 and the center Q of the stator 50. Are connected in the axial direction by caulking pins 56. For example, a caulking pin insertion hole is formed in each electromagnetic steel sheet at a connecting portion (on the line La) that intersects the line La. And in the state which laminated | stacked the several electromagnetic steel plate, a crimping pin is inserted in the crimping pin insertion hole currently formed in each electromagnetic steel plate, and a some electromagnetic steel plate is fixed integrally. Thereby, a some electromagnetic steel plate is connected with an axial direction.
In the present embodiment, a plurality of electromagnetic steel plates can be connected in the axial direction using caulking pins for integrating the laminated electromagnetic steel plates.

The stator 50 is inserted into a stator insertion space 20 a formed by the inner peripheral surface 20 </ b> A of the housing 20, and then fixed to the housing 20 at a fixing location in the connection region S. The stator 50 is inserted into the stator insertion space 20a of the housing 20, and a sectional view (sectional view along the axial direction) of the electric motor 40 is shown in FIG. 11, and a sectional view taken along line XII-XII in FIG. A right-angled cross-sectional view) is shown in FIG. In the present embodiment, similarly to the first embodiment, both of the boundary portions 51a and 51b are set as fixed portions, and a welding method is used as a method of fixing the stator 50 to the housing 20. Further, an end face 50 </ b> A on one side in the axial direction is set as an axial fixing portion for fixing the stator 50 to the housing 20.
In the present embodiment, the stator 50 can be fixed to the housing 20 by the welded portion 53b on the end surface 50B on the other axial side of the stator 50. In addition, the stator 50 can be fixed to the housing 20 by the welded portions 53a and 53b on the end surface 50A on the one axial side of the stator 50 and the end surface 50B on the other axial side.

In the first to third embodiments, “each of the boundary portions 51 a and 51 b between the second outer peripheral surface 52 and the first outer peripheral surface 51 arranged on both sides in the circumferential direction of the second outer peripheral surface 52. And a region S surrounded by boundary lines Lb and Lc (including the boundary lines Lb and Lc) connecting the center Q of the stator 50 and the stator 50 "is a circumferential direction as viewed in a cross section perpendicular to the axial direction of the present invention. Corresponds to “a plurality of connected regions arranged along”. Further, “at least one of the end surface 50A on the one axial side of the stator 50 and the end surface 50B on the other axial side of the stator 50, the first outer peripheral surface 51 and the second outer peripheral surface 52 of the stator 50 The configuration in which the stator 50 is welded to the housing 20 by at least one of the welded portions 53a and 53b at the boundary portions 51a and 51b is “the axial connection of a set number of connection regions when the motor is driven”. This corresponds to the configuration in which the stator is fixed to the housing at a fixed number of fixed regions of the connection region so that tensile stress is applied to the points.
Further, in the first embodiment, “a plurality of electromagnetic steel plates are axially coupled by welding (welded portion 54) at the location of the circumferential center 51 c of the second outer circumferential surface 52 of the stator 50. Configuration, “a plurality of electrical steel sheets are clamped at a fixing point where a plurality of electromagnetic steel sheets intersect a line La connecting the center Q of the second outer peripheral surface 52 of the stator 50 and the center Q of the stator 50. 55 ”, in the third embodiment,“ a plurality of electromagnetic steel sheets connect the circumferential center 51c of the second outer circumferential surface 52 of the stator 50 and the center Q of the stator 50 ”. The configuration in which the fixed portions intersecting the line La are connected in the axial direction by the caulking pin 56 is “the plurality of plate-like members forming the stator are connected in the axial direction at the connecting portions in the connecting region” of the present invention. Corresponds to the “configured” configuration.
In the first to third embodiments, the axial connection points can be arranged at appropriate positions in the connection region S.

As a method of connecting a plurality of electromagnetic steel sheets forming the stator 50 in the axial direction, a method of connecting in the axial direction by welding (first embodiment), a method of connecting in the axial direction by clamping (second embodiment) And a method of connecting in a plurality of axial directions selected from among a method of connecting in the axial direction with caulking pins (third embodiment) and the like can also be used in combination.
FIG. 13 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the fourth embodiment using the method of connecting in the axial direction by welding and the method of connecting in the axial direction by clamping. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, the circumferential center of the axial connection location by welding (welded portion 54) and the circumferential center of the axial connection location by the clamp 55 are the second. It arrange | positions so that the line La which connects the circumferential direction center 51c of the outer peripheral surface 52 and the center Q of the stator 50 may be crossed (on line La).
FIG. 14 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the fifth embodiment using the method of connecting in the axial direction by welding and the method of connecting in the axial direction by caulking pins. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, the circumferential center of the axially connected portion by welding (welded portion 54) and the circumferential center of the axially connected portion by caulking pin 56 are the second It arrange | positions so that it may cross | intersect the line La which connects the circumferential direction center 51c of the outer peripheral surface 52, and the center Q of the stator 50 (on line La).
Sectional drawing of motor 40 of 6th Embodiment using the method of connecting in the axial direction by welding, the method of connecting in the axial direction by clamping, and the method of connecting in the axial direction by caulking pins (cross-sectional view perpendicular to the axial direction) ) Is shown in FIG. In the present embodiment, the circumferential center of the axial connection location by welding (welded portion 54), the circumferential center of the axial connection location by the clamp 55, and the circumferential center of the axial connection location by the caulking pin 56, It arrange | positions so that the line La which connects the circumferential direction center 51c of the 2nd outer peripheral surface 52 and the center Q of the stator 50 may be crossed (on line La).
A method of connecting in the axial direction by a clamp and a method of connecting in the axial direction by a caulking pin can also be used.
In the fourth to sixth embodiments, the circumferential center of each of the plurality of axially connected portions intersects with a line La connecting the circumferential center 51 c of the second outer peripheral surface 52 and the center Q of the stator 50. As described above, the plurality of axially connected portions are arranged. However, the plurality of axially connected portions can be arranged at appropriate positions in the connecting region S. For example, the line La connecting the circumferential center 51c of the second outer peripheral surface 52 and the center Q of the stator 50 intersects any one of the plurality of axially connected portions in a plurality of axial directions. You may arrange | position a connection location. Moreover, you may arrange | position so that the line | wire which connects locations other than the circumferential center 51c of the 2nd outer peripheral surface 52 and the center Q of a stator may cross | intersect. Further, all of the plurality of connected portions may not intersect one line passing through the center Q of the stator.

In the first to sixth embodiments, in the stator insertion space 20a of the housing 20, at least one of the end surface 50A on the one axial side and the end surface 50B on the other axial side of the stator 50 is fixed to the stator. Although the method of welding 50 to the housing 20 (welded portions 53a and 53b) is used, the method of welding the stator 50 to the housing 20 is not limited to this.
An electric motor 40 according to a seventh embodiment using a method of welding a stator to a housing through a communication hole formed in the housing will be described. In addition, FIG. 16 shows a cross-sectional view (cross-sectional view along the axial direction) of the housing 20 of the present embodiment. 17 is a cross-sectional view (cross-sectional view along the axial direction) of the electric motor 40 in which the stator 50 is inserted into the stator insertion space 20a of the housing 20. FIG. 17 is a cross-sectional view taken along the line XVIII-XVIII in FIG. FIG. 18 shows a cross-sectional view at a right angle.
In the present embodiment, as in the first embodiment, the first outer peripheral surface 51 and the second outer peripheral surface 52 are alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction. Has a stator 50 having an outer peripheral surface formed thereon.

Here, in the present embodiment, a method of welding the stator 50 to the housing 20 through at least one of the communication holes 21 a to 21 c formed in the housing 20 is used. In order to weld the stator 50 to the housing 20 at the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 of the stator 50 (the boundary portions 51a and 51b are set as fixed portions) It is necessary to form communication holes 21 a to 21 c in the housing 20 at locations facing the boundary locations 51 a and 51 b of the stator 50. However, when the stator 50 is welded to the housing 20 through the communication holes 21a to 21c formed at the locations facing the boundary portions 51a and 51b of the stator 50, the second outer peripheral surface 52 and the inside of the housing 20 There is a possibility that the molten metal flows out to the side of the hole (passage) 52a formed between the peripheral surface 20A. In addition, since the welding time is required, the insulating member that insulates the slot 59 of the stator 50 from the stator winding 60 may be melted to cause insulation failure. In addition, it is difficult to completely seal the communication holes 21a to 21c of the housing 20, which is not suitable for a hermetic compressor.
In the present embodiment, the molten metal is prevented from flowing out through the hole (passage) 52a, the welding time is shortened to prevent the occurrence of insulation failure, and the communication holes 21a to 21c are easily sealed. In order to make it possible, the communication holes 21a to 21c are formed in the vicinity of the boundary portions 51a and 51b. That is, as shown in FIG. 18, when viewed in a cross section perpendicular to the axial direction, from the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52, along the circumferential direction, It is formed in a location (a location in the vicinity of the boundary locations 51a and 51b) that is away from the second outer peripheral surface 52. And the 1st outer peripheral surface 51 of the stator 50 is welded to the housing 20 by welding (welding part 57a) through the communicating holes 21a-21c in the vicinity of the boundary locations 51a and 51b.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, boundary lines Lb connecting the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 and the center Q of the stator 50, and A region surrounded by lines Ld and Le that are separated from Lc from the second outer peripheral surface 52 on the opposite side in the circumferential direction (= region surrounded by lines Lb and Lc + second outer peripheral surface 52 from line Lb) The second outer peripheral surface 52 and the neighboring region on the opposite side in the circumferential direction> the region surrounded by the lines Lb and Lc) are set as the connecting region S. That is, the lines Ld and Le that are separated from the boundary lines 51a and 51b on the opposite side of the second outer peripheral surface in the circumferential direction are used as the area lines that define the connection area S (the connection area S includes the boundary lines Lb and Lc). Including).

The plurality of electromagnetic steel sheets forming the stator 50 are connected in the axial direction at the connection points in the connection region S when viewed in a cross section perpendicular to the axial direction. In the present embodiment, the plurality of electromagnetic steel plates are connected in the axial direction by the welded portion 54 at the location of the circumferential center 51 c of the second outer circumferential surface 52.
In the housing 20, a communication hole that connects the inner peripheral surface 20 </ b> A and the outer peripheral surface 20 </ b> B to a location facing the fixed location in the connection region S in a state where the stator 50 is inserted into the stator insertion hole 20 a of the housing 20. 21a to 21c are formed. For example, when the stator 50 is welded to the housing 20 on the end surface 50A on one axial side of the stator 50, the stator 50 is fixed in a state where the stator 50 is disposed at a fixed position in the stator insertion space 20a of the housing 20. A communication hole 21 a is formed at a location facing the fixed location of the end face 50 </ b> A on one axial side of the child 50. In addition, when the stator 50 is welded to the housing 20 on the end surface 50B on the other side in the axial direction, the communication hole 21b is formed at a location facing the fixed location on the end surface 50B on the other side in the axial direction. In addition, when the stator 50 is welded to the housing 20 at a fixed portion between the end surface 50A on the one axial side of the stator 50 and the end surface 50B on the other axial side, a communication hole is formed in a portion facing the fixed portion. 21c is formed. The axial fixing portion for fixing the stator 5 to the housing 20 is between the end surface 50A on one axial side of the stator 50 and the end surface 50B on the other axial side (the end surface 50A on one axial side and the other side in the axial direction). At least one (including one end face 50B) may be set.
In the present embodiment, the stator 50 includes a welded portion 57a formed in the communication hole 21a of the housing 20, a welded portion 57b formed in the communication hole 21b, or a welded portion 57c formed in the communication hole 21c. Is fixed to the housing 20 by at least one weld.

  In the present embodiment shown in FIG. 18, “locations that are farther away from the second outer peripheral surface 52 and in the circumferential direction than the boundary portions 51 a and 51 b between the first outer peripheral surface 51 and the second outer peripheral surface 52. A region S surrounded by lines Ld and Le that connect the center Q of the stator 50 to each other (> a region surrounded by the boundary lines Lb and Lc) is a “cross-sectional view perpendicular to the axial direction” of the present invention. , Corresponding to a plurality of connected regions arranged along the circumferential direction. In addition, “a plurality of electromagnetic steel sheets are connected in the axial direction by the welded portion 54 at the location of the circumferential center 51c of the second outer peripheral surface 52 (the location of the circumferential center 51c is set as the connection location)” However, this corresponds to the configuration of “the plurality of plate-like members forming the stator are connected in the axial direction at the connection points in the connection region” of the present invention. Further, “the stator 50 is fixed to the housing 20 by the welded portions 57a to 57c formed in the communication holes 21a to 21c of the housing at a fixing portion (on the lines Ld and Le) that intersects the lines Ld and Le. In the present invention, at least when the electric motor is driven, the stator is attached to the housing at the fixed number of the fixed number of connecting regions so that tensile stress is applied to the axially connected points of the set number of connected regions. Corresponds to the “fixed” configuration.

In the first to seventh embodiments, the stator at both the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 (both adjacent portions of the boundary portions 51a and 51b). 50 is fixed to the housing 20 (both boundary portions are set as fixed portions), but the stator 50 is fixed to the housing at one of the boundary portions 51a and 51b (one of the adjacent portions of the boundary portions 51a and 51b). (One of the boundary points is set as a fixed point).
FIG. 19 is a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the eighth embodiment in which one of the boundary portions 51a and 51b (one of the adjacent portions of the boundary portions 51a and 51b) is set as a fixed portion. It shows.
In the present embodiment, the outer peripheral surface of the stator 50 is formed by the first outer peripheral surface 51 and the second outer peripheral surface 52 that are alternately arranged along the circumferential direction, as in the first embodiment. Has been. Further, the plurality of electromagnetic steel sheets forming the stator 50 are connected in the axial direction by the welded portion 54. Further, the stator 50 has a welded portion 53a at one of the boundary portions 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52 as viewed in a cross section perpendicular to the axial direction. It is being fixed to the housing 20 by.
As described above, it is preferable to dispose the connection portion and the fixing portion so that the circumferential center of the axial connection portion and the fixing portion intersects a line passing through the center Q of the rotor. Here, a welded portion 54 for connecting a plurality of electromagnetic steel plates in the axial direction and a welded portion 53a for fixing the stator 50 to the housing 20 intersect with a line passing through the center Q of the stator 50. It is difficult to place. For this reason, in the present embodiment, the plurality of electromagnetic steel plates forming the stator 50 are seen in a cross section perpendicular to the axial direction, the boundary portion 51a between the first outer peripheral surface 51 and the second outer peripheral surface 52, and Crosses a line Lf that connects the center Q of the stator 50 with a location (a location in the vicinity of the boundary location 51 b) that is separated from the one boundary location 51 b of 51 b toward the second outer peripheral surface 52 along the circumferential direction ( It is connected in the axial direction by a weld 54 at a connection point (on line Lf). In the present embodiment, a location where the line Lf intersects the second outer peripheral surface 52 is set as a connecting location in the axial direction.
A plurality of electrical steel sheets are connected in the axial direction by the welded portion 54 at a connection location (a location in the vicinity of the boundary location 51a) that is separated from the other boundary location 51a toward the second outer peripheral surface 52 along the circumferential direction. Then, the stator 50 may be fixed to the housing 20 at the other boundary portion 51a on the one end surface 50A in the axial direction of the stator 50 by the welded portion 53a. Further, the stator 50 can be fixed to the housing 20 by the welded portion 53b on the end surface 50B on the other side in the axial direction. In addition, the stator 50 can be fixed to the housing 20 by the welded portions 53a and 53b on the end surface 50A on the one axial side and the end surface 50B on the other axial side. The method of joining the stator 50 to the housing 20 is not limited to the welding method.

  In the present embodiment, when viewed in a cross section perpendicular to the axial direction, a portion (a portion near the boundary portion 51b) that is separated from the one boundary portion 51b toward the second outer peripheral surface 52 along the circumferential direction and the stator 50. A region surrounded by lines Lg and Lh that are separated from each other by an angle θa on both sides in the circumferential direction from the line Lf connecting the centers Q is set as a connection region S. That is, the connection area S is defined by the lines Lg and Lh (the connection area S includes one boundary line Lc).

  In the present embodiment, “a region S surrounded by lines Lg and Lh that are separated by an angle θa on both sides in the circumferential direction from a line Lf that connects the vicinity of one boundary 51b (51a) and the center Q of the stator 50. "Corresponds to" a plurality of connecting regions arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction "of the present invention. In addition, “a plurality of electrical steel sheets are connected in the axial direction by the welded portion 54 at a connecting portion that intersects a line Lf that connects the vicinity of one boundary portion 51b (51a) and the center Q of the stator 50”. The configuration corresponds to the configuration of “the plurality of plate-like members forming the stator are connected in the axial direction at the connection portion of the connection region” of the present invention. Further, “when viewed in a cross section perpendicular to the axial direction, at one boundary portion 51b (51a) (the boundary portion 51b (51a) is set as a fixed portion), the stator 50 is welded to the housing 20 by the welded portion 53a or 53b. In the present invention, at least when the electric motor is driven, the stator is attached to the housing at the fixed number of the fixed number of connecting regions so that tensile stress is applied to the axially connected points of the set number of connected regions. Corresponds to the “fixed” configuration.

FIG. 20 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the ninth embodiment in which one of the boundary portions 51a and 51b is set as a fixed portion.
In the present embodiment, the outer peripheral surface of the stator 50 is formed by the first outer peripheral surface 51 and the second outer peripheral surface 52 that are alternately arranged along the circumferential direction, as in the first embodiment. Has been.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, a line Lg that is separated from the line Lf (= boundary line Lc) between one boundary location 51b and the center Q of the stator 50 by an angle θa on both sides in the circumferential direction. A region surrounded by Lh is set as a connected region S. That is, the connection area S is defined by the lines Lg and Lh (the connection area S includes one boundary line Lc).
The plurality of electromagnetic steel sheets forming the stator 50 are seen from a cross section perpendicular to the axial direction, and one boundary location 51b of the boundary locations 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52. Are connected in the axial direction by a clamp 55 at a connecting point (on the line Lf) that intersects the line Lf that connects the center Q of the stator 50. And the stator 50 is being fixed to the housing 20 by the welding part 53a in the end surface 50A of the axial direction one side of a stator at one boundary location 51b (the boundary location 51b is set as a fixed location). Of course, a plurality of electrical steel sheets are connected in the axial direction by the clamp 55 at the connecting portion on the other boundary portion 51a side, and the welded portion 53a is formed on the end surface 50A on the one axial side at the fixed portion on the other boundary portion 51a side. The stator 50 may be fixed to the housing 20 by the above. Further, the stator 50 may be fixed to the housing 20 with the welded portions 53a and 53b on the end surface 50A on the one axial side and the end surface 50B on the other axial side.

FIG. 21 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the tenth embodiment in which one of the boundary portions is set as a fixed portion.
In the present embodiment, the outer peripheral surface of the stator 50 is formed by the first outer peripheral surface 51 and the second outer peripheral surface 52 that are alternately arranged along the circumferential direction, as in the first embodiment. Has been.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, it is surrounded by lines Lg and Lh that are separated by an angle θa on both sides in the circumferential direction from the line Lf that connects one boundary location 51b and the center Q of the stator 50. The connected area is set as the connected area S. That is, the connection area S is defined by the lines Lg and Lh (the connection area S includes one boundary line Lc).
The plurality of electromagnetic steel sheets forming the stator 50 are seen from a cross section perpendicular to the axial direction, and one boundary location 51b of the boundary locations 51a and 51b between the first outer peripheral surface 51 and the second outer peripheral surface 52. Are connected in the axial direction by caulking pins 56 at connecting points (on the line Lf) that intersect the line Lf connecting the center Q of the stator 50. And the stator 50 is being fixed to the housing 20 by the welding part 53a in the end surface 50A of the axial direction one side of a stator at one boundary location 51b (the boundary location 51b is set as a fixed location). About a connection location and a fixed location, the change similar to 9th Embodiment is possible.

  In the ninth and tenth embodiments, “they are surrounded by lines Lg and Lh that are separated from each other in the circumferential direction by an angle θa from a line Lf that connects one boundary portion 51b (51a) and the center Q of the stator 50. The “region S” corresponds to “a plurality of connected regions arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction” of the present invention. In addition, “a plurality of electromagnetic steel plates are connected in the axial direction by clamps 55 or caulking pins 56 at connection points that intersect a line Lf connecting one boundary point 51b (51a) and the center Q of the stator 50”. However, this corresponds to the configuration of “the plurality of plate-like members forming the stator are connected in the axial direction at the connection points in the connection region” of the present invention. Further, “as viewed in a cross section perpendicular to the axial direction, at one boundary location 51b (51a) (the boundary location 51b (51a) is set as a fixed location), the stator 50 is welded to the housing 20 by the welding portion 53a or 53b. The configuration of the stator of the present invention is “at least when the electric motor is driven, so that a tensile stress is applied to the axially connected portions in the set number of connected regions. Corresponds to the “fixed to” configuration.

In the eighth to tenth embodiments, the stator 50 and the housing 20 are welded in the stator insertion space 20a. However, the stator 50 is fixed to the housing 20 by welding via a communication hole formed in the housing. You can also.
FIG. 22 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 of the eleventh embodiment in which one boundary point (a vicinity of one boundary point) is set as a fixed point.
Here, as described above, when welding is performed through the communication holes 21a to 21c formed at a location facing the one boundary location 51b, a gap between the second outer peripheral surface 52 and the inner peripheral surface 20A of the housing 20 is obtained. There is a risk that molten metal may flow out into the hole (passage) 52a formed in the wire, or that the insulation member that insulates the slot 59 of the stator 50 from the stator winding 60 may be melted due to welding time, resulting in poor insulation. There is. Further, it is difficult to completely seal the communication holes 21 a to 21 c of the housing 20.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, at a location away from one boundary location 51b on the opposite side of the second outer peripheral surface 52 (in the vicinity of one boundary location 51b), The stator 50 is welded to the housing 20 by welding portions 57a to 57c formed in the communication holes 21a to 21c.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, a portion (a vicinity of one boundary portion 51b) that is separated from one boundary portion 51b on the opposite side of the second outer peripheral surface 52 in the circumferential direction and the stator A region surrounded by lines Lg and Lh that are separated by an angle θa on both sides in the circumferential direction from the line Lf connecting 50 centers Q is set as a connection region S. That is, the connection area S is defined by the lines Lg and Lh (the connection area S includes one boundary line Lc).
In the present embodiment, a plurality of electromagnetic steel plates are connected in the axial direction by the clamp 55 at the connecting portion on the other boundary location 51a side, and the stator 50 is connected by the welded portion 57a at the fixing location on the other boundary location 51a side. It may be fixed to the housing 20. Further, the stator 50 includes at least one axial direction between the end surface 50A on the one axial side and the end surface 50B on the other axial side (including the end surface 50A on the one axial side and the end surface 50B on the other axial side). It can be fixed to the housing 20 by a welded portion at a fixed location (an arbitrary fixed location in the axial direction or a plurality of fixed locations in the axial direction).

In the present embodiment, “an angle θa from the line Lf connecting the center Q of the stator 50 to a portion that is distant from the second outer peripheral surface 52 and the center Q of the stator 50 from one boundary portion 51b (51a). The “region S surrounded by the separated lines Lg and Lh” corresponds to “a plurality of connecting regions arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction” of the present invention. In addition, “a plurality of electromagnetic steel plates are fixed at a position where the second outer peripheral surface 52 and the opposite side in the circumferential direction are separated from one boundary position 51b (51a) and a line Lf that connects the center Q of the stator 50. The configuration of “coupled in the axial direction by the clamp 55” corresponds to the configuration of “the plurality of plate-like members forming the stator are coupled in the axial direction at the coupling points in the coupling region” of the present invention. To do. Further, “the stator 50 is a fixed portion that intersects a line Lf that connects the center Q of the stator 50 with a portion that is separated from the one outer peripheral surface 51b (51a) in the circumferential direction opposite to the second outer peripheral surface 52. Is connected to the housing 20 by the welded portion 57a ", the configuration of the connection region of the set number so that a tensile stress is applied to the connection points in the axial direction of the set number of connection regions at least when the electric motor is driven. Corresponds to the configuration in which the stator is fixed to the housing at the fixed portion.
In addition, a connection location and a fixed location can be set in the appropriate location in the connection area | region S. FIG.

In the first to eleventh embodiments, at least one of the boundary locations between the first outer peripheral surface and the second outer peripheral surface (location in the vicinity of the boundary location) is fixed to the housing. Although set as a fixed location, locations other than the boundary location between the first outer peripheral surface and the second outer peripheral surface (locations in the vicinity of the boundary location) can also be set as fixed locations.
Fixing of the electric motor 40 according to the twelfth embodiment in which a place (any place on the outer peripheral face) other than the boundary place between the first outer peripheral face and the second outer peripheral face (a place near the boundary place) is set as a fixed place. A cross-sectional view (cross-sectional view perpendicular to the axial direction) of the child 150 is shown in FIG.
In the electric motor of the present embodiment, the stator 150 is formed by first outer peripheral surfaces 151 and second outer peripheral surfaces 152 that are alternately arranged in the circumferential direction when viewed in a cross section perpendicular to the axial direction. . In the present embodiment, a hole (passage) formed between second outer peripheral surface 152 and inner peripheral surface 120A of housing 120 is used as a passage through which a medium such as a refrigerant flows. In the present embodiment, the second outer peripheral surface 152 can be omitted, that is, it has only the first outer peripheral surface 151 (having a circular outer peripheral surface when viewed in a cross section perpendicular to the axial direction). ) A stator 150 can also be used.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction, a line Lg separated by an angle θa on both sides in the circumferential direction from a line Lf connecting an arbitrary portion of the first outer peripheral surface 151 and the center Q of the stator 150, and A region surrounded by Lh is set as a connected region S. In other words, the connection region S is defined by the lines Lg and Lh. The connection region S includes the first outer peripheral surface 51 and the second outer peripheral surface 52 as in the embodiment shown in FIGS. Boundary points 51a and 51b (near points of the boundary points 51a and 51b) and the boundary lines Lb and Lc that connect the center Q of the stator 150 are not included.
The plurality of electromagnetic steel plates forming the stator 150 are connected in the axial direction at the connection points in the connection region S. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, at a connecting point (on line Lf) that intersects a line Lf that connects an arbitrary portion of the first outer peripheral surface 151 and the center Q of the stator 150, It is connected in the axial direction by a clamp 155.

As shown in FIG. 24, the stator 150 is inserted into the stator insertion space 120 a formed by the inner peripheral surface 120 </ b> A of the housing 120 and then fixed to the housing 120 at a fixing point in the connection region S. Fixed. 25 is a cross-sectional view (cross-sectional view along the axial direction) of the electric motor 40 in which the stator 150 is inserted into the stator insertion space 120a of the housing 120. FIG. 25 is a cross-sectional view along the XXVI-XXVI line in FIG. FIG. 26 shows a cross-sectional view perpendicular to FIG.
As described above, the dimension (for example, the diameter) of the first outer peripheral surface 151 of the stator 150 and the dimension (for example, the diameter) of the inner peripheral surface 120A of the housing 120 are the same as the stator insertion space of the housing 120. It is set by the method of inserting in 120a.
In the present embodiment, a welding method is used as a method of fixing the stator 150 to the housing 120. Further, as a method of welding the stator 150 to the housing 120, a method of welding through a communication hole formed in the housing 120 is used. For this reason, in the housing 120, in a state where the stator 150 is inserted at a fixed position in the stator insertion space 120a, a communication hole 121a that connects the inner peripheral surface 120A and the outer peripheral surface 120B to a position facing the fixed position. To 121c are formed. For example, the communication hole 121a is formed at a location facing the fixed location of the end surface 150A on the one axial side of the stator 150. Or the communicating hole 121b is formed in the location which opposes the fixed location of the end surface 150B of the axial direction other side of the stator 150. As shown in FIG. Alternatively, the communication hole 121c is formed at a location facing a fixed location between the end surface 150A on the one axial side and the end surface 150B on the other axial side. An axial fixing portion for fixing the stator 150 to the housing 120 is between an end surface 150A on one axial side and an end surface 150B on the other axial side (end surface 150A on one axial side and end surface on the other axial side). 150B (including one) may be set (any one fixed position in the axial direction or a plurality of fixed positions in the axial direction). Accordingly, the stator 150 is fixed to the housing 120 by the welded portions 157a, 157b, and 157c formed in the communication holes 121a, 121b, and 121c of the housing 120.

Fixing of the electric motor 40 according to the thirteenth embodiment in which a location (any location on the outer peripheral surface) other than the boundary location (a location near the boundary location) between the first outer peripheral surface and the second outer peripheral surface is set as a fixed location. A cross-sectional view (cross-sectional view perpendicular to the axial direction) of the child 150 is shown in FIG.
In the electric motor according to the present embodiment, the stator 150 has first outer peripheral surfaces 151 and a first outer surface 151 arranged alternately in the circumferential direction when viewed in a cross section perpendicular to the axial direction, as in the twelfth embodiment. 2 outer peripheral surfaces 152. In the present embodiment, the second outer peripheral surface 152 can be omitted.
In the present embodiment, as in the twelfth embodiment, when viewed in a cross section perpendicular to the axial direction, the circumferential direction is greater than a line Lf connecting an arbitrary portion of the first outer peripheral surface 151 and the center Q of the stator 150. A region surrounded by lines Lg and Lh separated by an angle θa on both sides is set as a connection region S.
The plurality of electromagnetic steel plates forming the stator 150 are connected in the axial direction at the connection points in the connection region S. In the present embodiment, when viewed in a cross section perpendicular to the axial direction, at a connecting point (on line Lf) that intersects a line Lf that connects an arbitrary portion of the first outer peripheral surface 151 and the center Q of the stator 150, The caulking pins 156 are connected in the axial direction.
The stator 150 is inserted into the stator insertion space 120 a formed by the inner peripheral surface 120 </ b> A of the housing 120, and then fixed to the housing 120 at a fixing location in the connection region S. FIG. 28 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the electric motor 40 in which the stator 150 is inserted into the stator insertion space 120 a of the housing 120.
In the present embodiment, as in the twelfth embodiment, a welding method is used as a method of fixing the stator 150 to the housing 120. Further, as a method of welding the stator 150 to the housing 120, a method of welding through the communication holes 121a to 121c formed in the housing 120 is used.

Fixation of the electric motor 40 according to the fourteenth embodiment in which a location (any location on the outer circumference) other than the boundary location (a location near the boundary location) between the first outer peripheral surface and the second outer peripheral surface is set as a fixed location. FIG. 29 shows a cross-sectional view (cross-sectional view perpendicular to the axial direction) of the child 150.
In the electric motor according to the present embodiment, the stator 150 has first outer peripheral surfaces 151 and a first outer surface 151 arranged alternately in the circumferential direction when viewed in a cross section perpendicular to the axial direction, as in the twelfth embodiment. 2 outer peripheral surfaces 152. In the present embodiment, the second outer peripheral surface 152 can be omitted.
In the present embodiment, as in the twelfth embodiment, when viewed in a cross section perpendicular to the axial direction, the circumferential direction is greater than a line Lf connecting an arbitrary portion of the first outer peripheral surface 151 and the center Q of the stator 150. A region surrounded by lines Lg and Lh separated by an angle θa on both sides is set as a connection region S.
The plurality of electromagnetic steel plates forming the stator 150 are connected in the axial direction at the connection points in the connection region S. In the present embodiment, they are connected in the axial direction by clamps 155 and caulking pins 156. The axial connection location by the clamp 155 and the axial connection location by the caulking pin 156 may be arranged in the connection area when viewed in a cross section perpendicular to the axial direction. Preferably, the clamp 155 and the caulking pin 156 are preferable. More preferably, however, the circumferential centers of the clamp 155 and the caulking pin 156 are arranged (on the line) so as to intersect a line passing through the center Q of the stator 150.
In addition, the fixing portion for fixing the stator 150 to the housing 120 may be set in the connection region S. Preferably, the clamp 155 and the caulking pin 156 and the fixing portion are more preferably the clamp 155 and the fixing portion. The center of the caulking pin 156 in the circumferential direction and the fixing portion are arranged so as to intersect (on the line) a line passing through the center Q of the stator 150. In addition, as described in FIG. 30, when a plurality of axially connected locations are set, a single axially connected location with the circumferential center being the circumferential center of the entire axially connected location is an axis. Equivalent to connecting in direction.

In the 11th to 14th embodiments, “a region S surrounded by lines Lg and Lh that are separated from each other by an angle θa on both sides in the circumferential direction from a line Lf connecting an arbitrary portion of the outer peripheral surface and the center Q of the stator 150. "Corresponds to" a plurality of connecting regions arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction "of the present invention. Further, “a plurality of electromagnetic steel plates are connected in the axial direction by at least one of a clamp 155 and a caulking pin 156 at a fixed portion that intersects a line Lf connecting an arbitrary portion of the outer peripheral surface and the center Q of the stator 150”. The configuration corresponds to the configuration of “the plurality of plate-like members forming the stator are connected in the axial direction at the connection points in the connection region” of the present invention. Further, “welding portions 157 a to 157 c in which the stator 150 is formed in the communication holes 121 a to 121 c of the housing 120 at a fixing portion that intersects a line Lf that connects an arbitrary portion of the outer peripheral surface and the center Q of the stator 150. The configuration is welded to the housing 120 by the “fixed portion of the set number of connection regions so that a tensile stress is applied to the connection points in the axial direction of the set number of connection regions at least when the electric motor is driven”. This corresponds to the configuration in which the stator is fixed to the housing.
In the 11th to 14th embodiments, the stator 150 can be welded to the housing 120 without forming the communication holes 121a to 121c. For example, a method in which the stator 150 and the housing 120 are welded to at least one of the end surfaces on both axial sides of the stator 150 in the stator insertion space 120a can be used. Moreover, as a method of fixing the stator 150 to the housing 120, various methods other than the welding method can be used. In addition, as a method of connecting a plurality of electromagnetic steel plates constituting the stator 150 in the axial direction, one or more of various methods can be used.

  As described above, in the electric motor of the present invention, the plurality of plate-like members forming the stator are viewed in a cross section perpendicular to the axial direction, and are axially connected at the connection points in the plurality of connection regions along the circumferential direction. To form a combined portion with increased axial rigidity. Then, at least when the electric motor is driven, a tensile stress is applied to the axially connected portions (a combined portion with increased axial rigidity) in the set number of connected regions, thereby suppressing the compressive stress applied to the entire stator. As described above, the stator is fixed to the housing at fixed points within the set number of connection regions. As a result, tensile stress is applied to the stator and compressive stress is prevented from being applied, so that a decrease in the magnetic permeability of the stator due to the compressive stress is suppressed. A decrease in efficiency can be prevented. Further, even when the electric motor is driven at a high temperature and a high pressure, it is possible to prevent a reduction in the holding force of the stator due to the expansion of the stator and the housing.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
Each configuration described in the embodiment can be used alone, or a plurality of appropriately selected configurations can be used in combination.
The width and number of the connection regions can be selected as appropriate.
As a method of connecting a plurality of plate-like members forming the stator in the axial direction, one of various connecting methods can be used, or a plurality of appropriately selected connecting methods can be used in combination. You can also. Moreover, the connection location of an axial direction can be set to the appropriate location in a connection area | region. Preferably, the plurality of axial connection points are set to intersect a line passing through the center of the stator.
Various fixing methods can be used as a method of fixing the stator to the housing. Further, the fixing point where the stator is welded to the housing can be set at an appropriate point in the connection region, but preferably, at least one connection point and the fixing point in the connection region are the center of the stator. It is set to intersect the line passing through.
The electric motor of the present invention is not limited to a permanent magnet electric motor, and can be configured as various types of electric motors. The electric motor of the present invention can be used as a drive source for various devices other than the compressor.
The configuration of the compressor is not limited to the configuration described in the embodiment.

According to the present invention, “(Aspect 1) includes a housing, a stator, and a rotor, and the stator is formed by a plurality of stacked plate-like members, and is formed by an inner peripheral surface of the housing. It is fixed to the housing in a state of being inserted into a child insertion space, and the rotor is an electric motor that is rotatably inserted into a rotor insertion space of the stator, and the stator is When viewed in a cross section perpendicular to the axial direction, it has a plurality of connection regions along the circumferential direction, and the plurality of plate-like members have axes of the plurality of connection regions as viewed in a cross section perpendicular to the axial direction. The stator is connected in the axial direction at a connecting point in the direction, and the stator is connected to the connecting point in the axial direction of the set number of connecting regions among the plurality of connecting regions when the electric motor is driven. The tensile stress that pulls from the center of the stator toward the outer periphery is As Waru, it can be configured as an electric motor. ", Characterized in that fixed to said housing at a fixed location of the coupling area of the set number.
Further, “(Aspect 2) is the electric motor according to Aspect 1, wherein the plurality of plate-like members are engaged with clamps formed on plate-like members stacked adjacent to each other in the axial direction. Thus, the motor is characterized in that it is connected in the axial direction. "
Also, “(Aspect 3) The electric motor according to Aspect 1 or 2, wherein the plurality of plate-like members are connected in the axial direction by caulking pins arranged in the axial direction. Can be configured.
Further, “(Aspect 4) is the electric motor according to any one of Aspects 1 to 3, wherein the plurality of plate-like members are axially joined by joining plate-like members stacked adjacent to each other in the axial direction. An electric motor characterized in that it is connected in the direction. "
Further, “(Embodiment 5) is the electric motor according to any one of Embodiments 1 to 4, wherein the outer peripheral surface of the stator is alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction. The first outer peripheral surface is formed by a second outer peripheral surface, the first outer peripheral surface has a shape corresponding to the inner peripheral surface of the housing, and the second outer peripheral surface is The second outer peripheral surface is recessed from the first outer peripheral surface toward the center of the stator and extends in the axial direction, and the set number of connection regions are viewed in a cross section perpendicular to the axial direction. And at least one of the boundary lines connecting the center of the stator and the boundary portion between each of the first outer peripheral surfaces arranged on both sides in the circumferential direction with the second outer peripheral surface interposed therebetween. An electric motor characterized by that. ”
Further, “(Aspect 6) In the electric motor according to Aspect 5, the fixed portions of the set number of connecting regions are seen on a cross section perpendicular to the axial direction, and both sides in the circumferential direction across the second outer peripheral surface. The electric motor is characterized in that it is set at at least one boundary location of the boundary locations between the first outer peripheral surfaces and the second outer peripheral surfaces arranged in the above.
Further, “(Aspect 7) is the electric motor according to Aspect 3 or 4, wherein the axially connected portion by the clamp of the set number of connecting regions, the axially connected portion by the caulking pin, or the axially connected portion by joining are: The electric motor is set so as to intersect with a line passing through the center of the stator when viewed in a cross section perpendicular to the axial direction.
Also, “(Embodiment 8) is the electric motor according to any one of Embodiments 1 to 7, wherein the set number of connection regions are in the axial direction of the set number of connection regions when viewed in a cross section perpendicular to the axial direction. An electric motor having a range of 15 degrees or less on both sides in the circumferential direction from a line connecting the circumferential center of the connection portion and the center of the stator.
Further, “(Aspect 9) The electric motor according to any one of Aspects 1 to 8, wherein the stator is fixed to the housing by welding at an end face on at least one of both end faces in the axial direction. It can be configured as an electric motor characterized by
Further, “(Aspect 10) is the electric motor according to any one of Aspects 1 to 9, wherein the housing is formed with a communication hole that communicates an outer peripheral surface and an inner peripheral surface, An electric motor characterized in that it is fixed to the housing by welding through a communication hole formed in the housing. "
Moreover, it can be configured as "(Aspect 11) The electric motor according to any one of Aspects 1 to 10, wherein the set number is 4 to 6."
Further, “(Aspect 12) is the electric motor according to any one of Aspects 1 to 11, wherein the set number of connecting regions are clamped in the axial direction, the axially connected portion by the caulking pin, or the axially connected portion is joined. The at least one axially connected portion and the fixed portion of the connecting portions are set so as to intersect with a line passing through the center of the stator when viewed in a cross section perpendicular to the axial direction. Can be configured as an electric motor. "
Moreover, it can be comprised as "(Aspect 13) It is a compressor which has an electric motor, Comprising: The electric motor in any one of the aspects 1-12 is used as said electric motor." .

DESCRIPTION OF SYMBOLS 10 Compressor 20, 120 Housing 20A, 120A Inner peripheral surface 20B, 120B Outer peripheral surface 20a, 120a Stator insertion space 21a-21c, 121a-121c Communication hole 30 Compression mechanism part 40 Electric motor 50, 150 Stator 50A, 50B, 150A , 150B Axial end face 50a, 150a Rotor insertion space 51, 151 First outer peripheral face 51a, 51b Boundary location 52, 152 Second outer peripheral face 52a, 152a Hole (passage)
53a, 53b, 57a, 57b, 57c, 157a, 157b, 157c Welded part (fixed part)
54 Welded part (connecting part)
55, 155 Clamp (connecting part)
56, 156 Caulking pin (connection part)
58, 158 Teeth 59, 159 Slot 60 Stator winding 70 Rotor 75 Rotating shaft 80 Accumulator

Claims (10)

A housing, a stator, and a rotor, wherein the stator is formed by a plurality of stacked plate-like members and is inserted into a stator insertion space formed by an inner peripheral surface of the housing And the rotor is an electric motor that is rotatably inserted into a rotor insertion space of the stator,
The stator has a plurality of connection regions along the circumferential direction when viewed in a cross section perpendicular to the axial direction,
The plurality of plate-like members are connected in the axial direction by engaging with clamps formed on the plate-like members stacked adjacent to each other in the axial direction at the axially connected portion in the connection region. Has been
The connection region is a region surrounded by a region line that is separated by an angle θa of 15 degrees or less on both sides in the circumferential direction from a line connecting the center in the circumferential direction of the connecting portion in the axial direction and the center of the stator,
The stator is fixed to the housing by welding via a communication hole formed in the housing at a fixing location in the connection region,
The stator is configured such that when the electric motor is driven, a tensile stress that pulls the axially connected portion from the center of the stator to the outer peripheral direction is applied to the axially connected portion in the connecting region. An electric motor characterized by that. The electric motor according to claim 1,
A line connecting the circumferential center of the fixed portion and the center of the stator is surrounded by a line connecting the circumferential one side end and the other circumferential end of the axial connecting portion and the center of the stator. An electric motor characterized by being in a region to be The electric motor according to claim 1 or 2,
The outer peripheral surface of the stator is formed by first and second outer peripheral surfaces alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction, The outer peripheral surface has a shape corresponding to the inner peripheral surface of the housing, and the second outer peripheral surface is recessed from the first outer peripheral surface toward the center of the stator. The electric motor according to claim 3,
The connection region includes at least one of boundary portions between the second outer peripheral surface and each of the first outer peripheral surfaces disposed on both sides in the circumferential direction with the second outer peripheral surface interposed therebetween. Electric motor. The electric motor according to claim 4,
The plurality of plate-like members are further welded by welding plate-like members laminated adjacent to each other in the axial direction at the axially connected portion on the second outer peripheral surface in the connection region. An electric motor connected in the axial direction. A housing, a stator, and a rotor, wherein the stator is formed by a plurality of stacked plate-like members and is inserted into a stator insertion space formed by an inner peripheral surface of the housing And the rotor is an electric motor that is rotatably inserted into a rotor insertion space of the stator,
The stator has a plurality of connection regions along the circumferential direction when viewed in a cross section perpendicular to the axial direction,
The outer peripheral surface of the stator is formed by first and second outer peripheral surfaces alternately arranged along the circumferential direction when viewed in a cross section perpendicular to the axial direction, The outer peripheral surface has a shape corresponding to the inner peripheral surface of the housing, and the second outer peripheral surface is recessed from the first outer peripheral surface to the center side of the stator,
The connection region includes at least one of boundary portions between the second outer peripheral surface and each of the first outer peripheral surfaces arranged on both sides in the circumferential direction across the second outer peripheral surface.
The plurality of plate-like members are axially connected by welding plate-like members stacked adjacent to each other in the axial direction at the axially connected portion on the second outer peripheral surface in the connection region. Connected to
The connection region is a region surrounded by a region line that is separated by an angle θa of 15 degrees or less on both sides in the circumferential direction from a line connecting the center in the circumferential direction of the connecting portion in the axial direction and the center of the stator,
The stator is fixed to the housing by welding via a communication hole formed in the housing at a fixing location in the connection region,
The stator is configured such that when the electric motor is driven, a tensile stress that pulls the axially connected portion from the center of the stator to the outer peripheral direction is applied to the axially connected portion in the connecting region. An electric motor characterized by that. The electric motor according to claim 6,
A line connecting the circumferential center of the fixed portion and the center of the stator is surrounded by a line connecting the circumferential one side end and the other circumferential end of the axial connecting portion and the center of the stator. An electric motor characterized by being in a region to be The electric motor according to any one of claims 1 to 7,
The plurality of plate-like members are further connected in the axial direction by caulking pins arranged in the axial direction at axially connected locations in the connection region. The electric motor according to any one of claims 1 to 8,
The connection region is provided with four to six locations along the circumferential direction. A compressor having an electric motor, wherein the electric motor according to any one of claims 1 to 9 is used as the electric motor.

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